Sash lock



FIG. 1 is a top plan view of a sash lock showing my new design:

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left end elevation view thereof; and

FIG. 6 is a right end elevation view thereof. 

The ornamental design for a sash lock, substantially as shown. 